Combining Types

In TypeScript, you can combine types using type union and type intersection.

Type Union:

The union operator | is used to combine two or more types into a single type that represents all the possible types. For example:

type stringOrNumber = string | number;
let value: stringOrNumber = 'hello';

value = 42;

Type Intersection:

The intersection operator & is used to intersect two or more types into a single type that represents the properties of all the types. For example:

interface A {
  a: string;
}

interface B {
  b: number;
}

type AB = A & B;
let value: AB = { a: 'hello', b: 42 };

Learn more from the following links:

• Union Types in TypeScript
• Intersection Types in TypeScript
• Type Aliases
• Keyof Type Operator